Peter -
Amorphous Unisolar panels could be what you need for shade campsites. If Don Pianotuna is telling the truth, which he usually is, in low-light conditions they work better than mono- or poly-crystalline panels. Those in the link are not just amorphous, but also flexible, so the guy just glued them to the roof, no holes to drill. Amorphous are less efficient per sq.ft than crystalline panels, so you'd better get more of them. There are amorphous panels in rigid form as well.
BFL, 70-ish dB noise from supposedly "quiet" and relatively small Honda 2000 you will find if you google up test results - not manufacturer's blurb. Though, contractors grade generators roar 85 dB at the same distance. And there are people camping out with those. To think of it, 85 dB is 3 times more sound pressure than 70 dB.
